plaque

1. N-COUNT A plaque is a flat piece of metal or stone with writing on it which is fixed to a wall or other structure to remind people of an important person or event. (金屬或石質(zhì)的) 匾額

The First Lady unveiled a commemorative plaque. 第一夫人為紀念牌匾揭了幕。

2. N-UNCOUNT Plaque is a substance containing bacteria that forms on the surface of your teeth. 牙菌斑

Deposits of plaque build up between the tooth and the gum. 牙菌斑的沉積物在牙齒和牙齦間形成。